The first two varieties ( Ranunculus orthorhynchus var. orthorhynchus and R . orthorhynchus var. platyphyllus ) are rather weak, intergrading extensively in California and Oregon. By contrast, R . orthorhynchus var. bloomeri often grows with the others with little or no intergradation (although intermediate populations are found in some areas), and it has been treated as a distinct species, R . bloomeri , by many taxonomists.